PLATE 58. 



Corynebacterium diphtherias. (Klebs, Loffler.) L. 



and N. 



Corynebacterium pseudodiphtheriticum. (Hofmann- 

 Wellenhof.) Lehm. and Neum. 



Corynebacterium xerosis. (Kuschbert, Neisser.) 

 Lehm. and Neum. 



I. Coryneb. diphtheriae. Glycerin-agar streak culture, three 

 days at 37. Luxuriant growth ; culture moist. 



II. Coryneb. diphtheriae. Glycerin-agar streak culture, three 

 days at 37. Delicate growth. 



III. Coryneb. pseudodiphtherit. Glycerin-agar streak culture, 

 three days at 37. Luxuriant growth, culture moist. 



IV. Coryneb. xerosis. Glycerin-agar streak culture, three days 

 at 37. Delicate growth; growth dry and dull. 



V. Coryneb. pseudodiphtherit. Glycerin-agar stab culture. 

 Surface growth, ten days at 37. The culture is reproduced on 

 account of its atypical brown color. 



VI. Coryneb. diphtherias. Gelatin stab culture. Surface 

 growth, ten days at 22. The color fluctuates from white to dirty 

 yellowish. 



VII. Coryneb. diphtheriae : 



(a) Glycerin-agar plate. Colonies upon the surface, three 

 days at 37. Luxuriant growth. The same culture 

 as I. 



(b) Glycerin-agar plate. Colonies upon the surface, three 

 days at 37. Delicate growth. The same culture as 



VIII a. Coryneb. pseudodiphtherit. Glycerin-agar plate. Colo- 

 nies lying upon the surface, three days at 37. Natural size. 

 Luxuriant growth. Answers to culture III. 



VIII b. Coryneb. xerosis. Glycerin-agar plate. Colonies lying 

 upon the surface, three days at 37. Natural size. Dry, dull 

 growth. Answers to culture IV. 



VIII c. Coryneb. xerosis. Glycerin-agar plate. Colonies lying 

 upon the surface, three days at 37. Natural size. Delicate growth. 

 Sometimes it may be still more delicate. 



IX. Coryneb. diphtheriae. Potato culture, ten days at 22. 

 The growth is typical, like a delicate veil, which in many places 

 leaves no trace on the potato. 



X. Coryneb. pseudodiphtherit. Potato culture, ten days at 

 22. The growth is sharply outlined, white to dirty yellowish, 



Natural 



